Plants dalam hal ini bisa berarti pabrik, atau mesin industri, tetapi dalam konteks kalimatnya, saya memilih mesin (industri)

Berikut kutipan definisi plant dari Cambridge English Dictionary:
plant noun (BUILDING/MACHINES)
› [U] ​machines used in ​industry:
The ​industry was ​accused of having ​invested little in ​workers, plant, or ​infrastructure.

› [C] a ​factory in which a ​particular ​product is made or ​power is ​produced:
Two more car-assembly plants were ​closed by the ​strike.

› [U] UK a ​large, ​heavy ​machine or ​vehicle used in ​industry, for ​building ​roads, etc.:
The ​sign by the ​roadworks said "Slow - ​heavy plant ​crossing".
The firm's ​main ​business was plant ​hire.